package com.neusoft.demo.controller;

import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.image.BufferedImage;
import java.io.IOException;
import java.util.Random;

import javax.imageio.ImageIO;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;

@Controller
public class CodeController {
	private int  width=120;
	private int height=40;
	private int codeCount=4;
	private int xx=15;
	private int fontHeght=18;
	private int codeY=18;
	char[] codeSequence= {'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X',
            'Y', 'Z', '0', '1', '2', '3', '4', '5', '6', '7', '8', '9' };

	@RequestMapping("/code")
	public void getCode(HttpServletRequest req,HttpServletResponse resp) throws IOException{
		BufferedImage buffImg=new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
		Graphics gd=buffImg.getGraphics();
		Random random=new Random();
		gd.setColor(Color.WHITE);
		gd.fillRect(0, 0, width, height);
		Font font=new Font("Fixedsys",Font.BOLD,fontHeght);
		gd.setFont(font);
		gd.setColor(Color.BLACK);
		gd.drawRect(0, 0, width-1, height-1);
		gd.setColor(Color.BLACK);
		for (int i=0;i<40;i++) {
			int x=random.nextInt(width);
			int y=random.nextInt(height);
			int x1=random.nextInt(12);
			int y1=random.nextInt(12);
			gd.drawLine(x, y, x+x1, y+y1);
		}
		StringBuffer randomCode=new StringBuffer();
		int red=0,green=0,blue=0;
		for(int i=0;i<codeCount;i++) {
			String code=String.valueOf(codeSequence[random.nextInt(codeSequence.length-1)]);
			red=random.nextInt(255);
			green=random.nextInt(255);
			blue=random.nextInt(255);
			gd.setColor(new Color(red,green,blue));
			gd.drawString(code,(i+1)*xx,codeY);
			randomCode.append(code);
		}
		HttpSession session=req.getSession();
		System.out.print(randomCode);
		session.setAttribute("code", randomCode.toString());
		resp.setHeader("Pragma", "no-cache");
		resp.setHeader("Cache-Control","no-cache");
		resp.setDateHeader("Expires",0);
		resp.setContentType("image/jpeg");
		ServletOutputStream sos=resp.getOutputStream();
		ImageIO.write(buffImg,"jpeg",sos);
		sos.close();
	}
}
